The get_user_grouplist function in the extdom plug-in in FreeIPA before 4.1.4 does not properly reallocate memory when processing user accounts, which allows remote attackers to cause a denial of service (crash) via a group list request for a user that belongs to a large number of groups.
https://fedorahosted.org/freeipa/ticket/4908
https://bugzilla.redhat.com/show_bug.cgi?id=1205200
http://www.securityfocus.com/bid/73376
http://rhn.redhat.com/errata/RHSA-2015-0728.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-March/154103.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/154314.html